Hi Sawan,
Are you using HipChat Server or Data Center? If so you can follow the instructions on this page to decrypt and expand the export:
If you're a *.hipchat.com (Cloud) user, you'll have to contact support to be able to obtain 1:1 chat data:
https://confluence.atlassian.com/hipchatkb/exporting-chat-history-753404166.html
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